I would say definitely either COD4 or Bioshock (I won't mention orange box because everyone seems to have already drilled that through your head far enough)
If your looking to mix in some variety you can try Street Fighter 4, Civilization: revolution, and Dead Rising.
If you want some fun offline Multiplayer games I would suggest Rockband 1 or 2 and if you have friends who see themselves as movie buffs try one of the scene it? games (seriously those can get very competitive)
And If you want some downloadable games I say castle crashers and Castlevania:SOTN which are well worth the money.
If your looking to mix in some variety you can try Street Fighter 4, Civilization: revolution, and Dead Rising.
If you want some fun offline Multiplayer games I would suggest Rockband 1 or 2 and if you have friends who see themselves as movie buffs try one of the scene it? games (seriously those can get very competitive)
And If you want some downloadable games I say castle crashers and Castlevania:SOTN which are well worth the money.